Indonesia Conference Directory

Corresponding Author
Dyah Eka Puspitasari

Institutions
Physics Department, Faculty of Mathematics and Natural Sciences, State University of Malang
Jalan Semarang 5, Malang 65145, Indonesia
*hari.wisodo.fmipa[at]um.ac.id

Abstract
In this work we investigate the dynamics of a square mesoscopic superconducting vortex in the presence of a magnetic field parallel to its axis. The rectangular cross section of the sample is L2 and the defex value α is engineered from the d2 region at the center of the superconductor material. L = 12ξ (0) for all simulations, α is engineered with values of 0 and 0.5, while d varies with sizes 2ξ and 4ξ. We study the vortex configuration and its effect on the free energy state. Significant differences from the free energy graph were obtained at t = 0 to t = 70, and again differed at t > 120. From the energy graph comparison, this difference in free energy values was most influenced by the free condensate energy terms.

Keywords
superconductor, defex, vortex, Ginzburg-landau

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/Z2eyCBg8GqUt

Corresponding Author
Mavindra Ramadhani

Institutions
1 Department of Materials Engineering, Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember,

2 Study Program of Welding Engineering, Shipbuilding Institute of Polytechnic Surabaya

E-mail : rochman[at]mat-eng.its.ac.id; alviantotow[at]gmail.com

Abstract
Overlay hardfacing is one of surface engineering technique to improve wear resistance and hardness performances of AISI 8655 steel for high abrasive working condition. The purposes of this paper are to describe the effect of polarities and pre-heat temperatures to microstructures, distribution of hardness and wear resistance of hardfaced specimens. The pieces of AISI 8655 substrate were heated at 150oC, 200oC, 250oC and 300oC as variable of pre-heating parameters. Pre-heated substrates were coated by buffer layer E309. Hard layer of E Fe3 was coated above buffer layer by welding technique with Direct Current Electrode Negative (DCEN) and Direct Current Electrode Positive (DCEP) as parameters. Chemical compositions, microstructures, hardness and wear resistance were performed in this paper. The wear resistance result, DCEP has reduction of thickness 0.14 mm, 0.11 mm, 0.09 mm and 0.13 mm. Meanwhile, DCEN has reduction of thickness 0.11 mm, 0.11 mm, 0.09 mm and 0.11 mm.

Keywords
Hardfacing; Polarities; Microstructures; Wear Resistance

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/84DG79KZpBFY

Corresponding Author
Eva Khikmiatul Maula

Institutions
(a)Department of Physics, Faculty of Mathematics and Natural Science, State University of Malang. Jl. Semarang 5 Malang, 65145 Indonesia
*nandang.mufti.fmipa[at]um.ac.id
(b)Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
(c)Department of Chemical Engineering, Petronas Technology University. Bandar Seri Iskandar, 32610, Perak, Malaysia

Abstract
The Effect of Thickness of Fe3O4 Film on the Nature of Photoelectrochemical (PEC) from Fabricated Fe3O4/ZnO Film Using Spin Coating Method Nandang Mufti(1,2)*, Eva Khikmiatul Maula(1), Yudyanto(1,2), Chusnana Insjaf Yogihati(1,2), Suriati Sufian(3), M. Tommy Hasan Abadi(1), Siti Maryam(1) 1Department of Physics, Faculty of Mathematics and Natural Science, State University of Malang. Jl. Semarang 5 Malang, 65145 Indonesia 2Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia 3Department of Chemical Engineering, Petronas Technology University. Bandar Seri Iskandar, 32610, Perak, Malaysia *Corresponding Author : nandang.mufti.fmipa@um.ac.id ABSTRACT: Photoelectrochemical (PEC) water splitting converts solar energy into electrical energy, and stored it in the form of hydrogen and oxygen molecules. In PEC system, semiconductor electrodes play an important role in the conversion of solar energy; ZnO is one of the semiconductor materials with excellent electrical properties which is suitable for an electrodes. However, wide band gap of ZnO about 3.37 eV only can be utilized for photon energy in the UV region of about 4%. Henceforth, a combination of ZnO with Fe3O4 is predicted to have advantages such as being able to absorb visible light, low toxicity, and easy achievement, therefore photoactivation can be improved. In this present study, Fe3O4/ZnO films were fabricated using spin coating and doctor blade methods. The XRD result shows that the crystal structure of ZnO and Fe3O4 are hexagonal and cubic spinel, respectively. while the thickness of Fe3O4, ZnO, and Fe3O4/ZnO can be seen in Cross-sectional SEM test. Fe3O4 layer can increase PEC efficiency, where the efficiency value produced in Fe3O4/ZnO film is 0.15%, greater than the single layer of ZnO film is 0.035% and a single layer of Fe3O4 film is 0.038%. Keywords: Photoelectrochemical, Crystal Structure, Efficiency

Keywords
Photoelectrochemical, Crystal Structure, Efficiency

Topic
Magnetic Methods

Link: https://ifory.id/abstract/urBtFjkXQmfP

Corresponding Author
Sunaryono Sunaryono

Institutions
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia
2Center of Advanced Materials for Renewable Energy (CAMRY), Universitas Negeri Malang, Jl. Semarang No. 5 Malang 65145, Indonesia

*Corresponding Author-s Email: sunaryono.fmipa[at]um.ac.id

Abstract
Iron oxide material is widely available in nature and can be explored in nanomaterial research and can be developed to be applied in the fields of industry, health, and technology. Iron oxides that are available in nature can be classified into several types, one of which is hematite. Hematite material doped with Zn was successfully synthesized using coprecipitation. Mass variations (0.1 and 0.3g) of Zn doping have also been carried out to determine the hematite behavior towards the characteristics of ZnxFe2-xO3 nanoparticles. ZnxFe2-xO3 nanoparticles were successfully characterized by using X-ray Diffraction (XRD) to determine the effect of Zn doping on crystal structure and particle size of ZnxFe2-xO3 nanoparticle, magneto-thermal to determine the thermal behavior of ZnxFe2-xO3 nanoparticles. The grain size of ZnxFe2-xO3 nanoparticles with doping masses of Zn 0.1 g and 0.3 g were obtained for 5 and 60 nm, respectively. The magneto-thermal analysis shows that the SAR value of ZnxFe2-xO3 nanoparticles with a doping mass of Zn 0.1 g and 0.3 g respectively 1.017 and 1.075 W / g. While the antimicrobial analysis of ZnxFe2-xO3 nanoparticles showed that the zone of inhibition was strengthened by the addition of Zn doping mass through the S. Aureus bacterium. Thus, ZnxFe2-xO3 nanoparticles are very potential to become antimicrobial agents.

Keywords
Hematite, ZnxFe2-xO3, SAR, antimicrobial, and Co-precipitation

Topic
Biomagnetism

Link: https://ifory.id/abstract/8M36xtmheHX7

Corresponding Author
Atsnaita Yasrina

Institutions
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang
2Physics Education Study Program, Faculty of Teacher Training and Education, University of Lampung

Abstract
The presence of accretion around neutron stars is assumed to be one of the causes of the decreasing of the magnetic field around neutron stars. The solution of the magnetic field decreasing equation describes the dynamics of the magnetic field around rapidly rotating neutron star. The equation is derived from the rapidly rotating neutron star metric and the first and second of the relativistic Maxwell equations. The solution to Maxwells equations in neutron stars by assuming the stars magnetic field is dipolar. The solution relativistic magnetic field dynamics equation around an accreting and rapidly rotating neutron star in the ZAMO (Zero Angular Momentum Observers) frame has been formulated. This equation corresponds to the slowly rotating neutron star case as conducted by Rezolla.

Keywords
Magnetic field, neutron stars, rapidly, ZAMO, solution

Topic
Magnetic Theory

Link: https://ifory.id/abstract/9nRqt7EYL3yh

Corresponding Author
Muchlis Fajar Hidayat

Institutions
Universitas Negeri Malang

Abstract
Last few years magnetic hydrogel called ferrogel was widely investigated for application in important fields such as in food industry and bio medic. This application is based on good properties which are owned by the ferrogel, for instance, good biocompatibility of the components and stimuli-responsive of the magnetic component. Ferrogel composed by magnetic nanoparticles filler inside the polymer hydrogel. This research focused on Polyvinyl Pyrrolidone/Polyvinyl Alcohol (PVP/PVA) hydrogel polymer with the filler of polyethylene glycol (PEG) MnxFe3-xO4-PEG which is rarely reported. The XRD and SAXS characterizations were used to analyzed the nanostructure of sample. The Mn concentration used was x = 0.6 which has particle size about 11.12 nm analyzed using XRD and has well confirmed with TEM result about 9.9 nm. Analysis using SAXS from ferrogel with filler variations yields primary and secondary particle size about 3.3 and 9.8 nm respectively. The optical properties of MnxFe3-xO4-PEG powder sample characterized using UV-Vis which is shown with the energy gap about 2.24 eV and refractive index 2.79. Using these data, the optical and electrical conductivity can be calculated each about 1.2 × 108 and 70 S. By this analysis then can be the fundamental study for the optical application of MnxFe3-xO4-PEG.

Keywords
Magnetic hydrogel, MnxFe3-xO4-PEG, optical properties, and electrical properties

Topic
Rock Magnetism

Link: https://ifory.id/abstract/6FUBC2f4XqL7

Corresponding Author
Susilawati Susilawati

Institutions
Physics Education, FKIP, University of Mataram, Lombok, West Nusa Tenggara Indonesia

Abstract
Barium M-hexaferriteswas synthesized with Co-Ni doping ion BaFe12-2xCoxNixO19) based on natural iron sand of Loang Balok beach in Sekarbela Subdistrict of Mataram Indonesia to be applied as micro wave absorbent material by using co precipitation method. To increase the effect of doping ion concentration variation (x = 0,0., 0,6 and 1,0) and calcinations temperature (T = 80, 600, and 800oC) on structure properties in samples was done by XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy) -EDX, TEM. Characterization of XRD showed in samples of iron oxide barium phase (BaFe12O19) and hematite phase (Fe2O3). The SEM-EDX results in the BaFe12CoNiO19 sample showed that the sample size had reached the nano-size ranging from 41nm to 151nm which was evenly distributed with the composition Ba = 12.22%; Fe = 49.1%; Co = 8.78%; Ni = 4.76%; And O = 21.37% with a slight impurity of Cl 3.77% whereas the TEM results show the resulting structure is hexagonal.

Keywords
Barium M-hexaferrites, Structure, nanopowder, co-precipation

Topic
Magnetic Methods

Link: https://ifory.id/abstract/geGEr8Y3kxVj

Corresponding Author
Rini Pujiastuti

Institutions
1.Departmen of Physics, Faculty of Mathematics and Science, Universitas Negeri Malang, Malang, 65115, Indonesia
2.Advance Material and Mineral Laboratory, Faculty of Mathematics and Science, Universitas Negeri Malang, Malang, 65115, Indonesia

Abstract
Magnetic susceptibility is a magnetic vulnerability that is often measured in rocks for various purposes. In this study, magnetic susceptibility was applied to distinguish weathering in rocks in different environments i.e. beaches and mountains. The rocks used are igneous rocks originating from Mount Sikambe and rocks on the coast of Prigi beach in Trenggalek Regency. The rock samples taken are rocks that have not undergone weathering, are half weathered and perfectly weathered rocks. The rock was crushed to form like a gravel, then tested magnetic susceptibility (χlf and χhf). The measurement results of rocks that have not decayed to perfect weathering in the mountain area of Sikambe show that the value of low frequency magnetic susceptibility (χlf) has a range of values (521.63-745.76)x 10-8 m3/kg, while in the coastal area Prigi has a range of values (4.65 - 7.72) x 10-8 m3/kg. From the values of χlf and χhf can be calculated the value of frequency dependent susceptibility (χfd). The average fd value in Gunung Sikambe is 0.2%, indicating that magnetic mineral grains are in the range of multi domains (MD) and on the coast of Prigi is about 6.06%, indicating that magnetic mineral grains are in the range of pseudo single domains (PSD) and single domain (SD).

Keywords
Susceptibility Magnetic, Weathering

Topic
Rock Magnetism

Link: https://ifory.id/abstract/73wZa2VQ8kpx

Corresponding Author
Rinta Bi Tari Erdyanti

Institutions
Department of Geophysical Engineering, Faculty of Civil, Environmental and Geo Engineering, Institut Teknologi Sepuluh Nopember, Surabaya

Abstract
Thermomagnetic analysis is a study of how a material react to the change in temperature. The analysis is conducted by either cooling or heating the material and observing the change of magnetic moment. Through this observation, the Curie Temperature of a material can be obtained. This Curie Temperature is used to estimate the magnetic minerals contained in samples e.g. rocks, sediments, soils. This paper introduces THERMITS, a novel MATLAB program for analyzing the thermomagnetic data acquired. There are several approaches used in this program. The first approach is by plotting magnetic moment (M) against temperature (T). For some data, the Curie Temperature can directly be perceived by observing this plot alone. However, other data need to be processed further in order to obtain its Curie Temperature. The data are processed through the other approaches, which are by plotting the first derivative and the second derivative of M against T. After determining the Curie Temperature through analyzing the trends of the graphs, mineral types can be estimated. We also provide plotting the difference between M of heating and cooling (ΔM) and its first and second derivative against T that might be useful for further analysis.

Keywords
: THERMITS, Curie Temperature, thermomagnetic, magnetic, MATLAB

Topic
Computation and Other Related Field

Link: https://ifory.id/abstract/Pzcthj8WRV6a

Corresponding Author
Tiffany Tjong

Institutions
1Electromagnetic Induction Lab., Physics of Complex System Div., Faculty off Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia

Abstract
We implemented sparse directs solver in our TE-mode magnetotelluric inversion program. The two dimensional inversion program was built using edge finite element modelling. The use of edge finite element could improve the accuracy of magnetotelluric modelling. However, solving the sparse linear system of edge finte element is very time consuming and this would affect the time required to solve the inversion problem. Using the sparse direct solver to solve the linear system in edge element modelling could make the inversion faster and more efficient.

Keywords
magnetotelluric, inversion

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/XCnMyvhrT7mj

Corresponding Author
Lisa Yihaa Roodhiyah

Institutions
(a) Electromagnetic Induction Lab., Physics of Complex System Div., Faculty of Mathematics and Natrural Sciences, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia
*lisa_yihaa[at]s.itb.ac.id

Abstract
Edge finite element (vector finite element) which is solved using sparse direct solver (PARDISO) has been used in this paper to model 2-D magnetotelluric field data (Papandayan field data). The site sounding of the field data which is used on this modeling are 10 site soundings. The focus of this paper is on the using 2-D magnetoteluric modeling scheme which is developed to model field data. First, the generating mesh to the field data and choosing the appropriate model are reviewed. Normalize coordinate to get the zero point before the meshing step is important so that the sensitivity matrices did not contain big amount of number which computationally can cause error in calculating matrices. Prior information needed to define the appropriate model. Second, the accuracy of the modeling result (apparent resistivity and phase) is compared to field data. In the end, it has shown that the modeling result has a good agreement with the field data which shows that there are divided by three areas with different resistivity. In the shallow depth (<1500 m) are dominated with low resistivity (around 5 Ωm). Next, the resistivity increases within the depth in 1500m until 3200m which are 150 Ωm until 300 Ωm. Then, finally the resistivity decreased in the deep depth (>3200 m) which around 3 Ωm.

Keywords
field data, magnetotelluric modeling, two-dimensional modeling, vector finite element, edge finite element, sparse direct solver

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/mZEfc4p8qvdX

Corresponding Author
Yoyok Laksono

Institutions
a) Department of Physics, Universitas Negeri Malang
* yoyok.adisetio.fmipa[at]um.ac.id
b) Centre for Environmental Sustainability & Water Security (IPASA), Faculty of Civil Engineering, Universiti Teknologi Malaysia

Abstract
The piezometer is generally used as a porewater pressure gauge at the core of the dam. Piezometer is placed in the upstream and downstream where if the upstream porewater pressure is higher than the downstream, the dam is in good condition. The piezometer that is planted in the dam can be damaged and the replacement is not possible to be done because it is embedded deep in the core of the dam. Because the piezometer basically measures the height of the water table to the piezometer so that if the height of the water table in the core of the dam is known, so the value of the pressure in the dam is known also. One way to find out the water level is to measure it by using georadar. The purpose of this study was to determine the feasibility of georadar to finding the porewater presure. As a case study, this study was conducted at the Sutami dam which still has a functioning piezometer. Measurements are made by B-scan at the location above the piezometer in the middle of the dam. The Radargram from the GPR is then analyzed in two steps, namely (1) determining the type of core material of the dam, and (2) calculating the pore pressure based on the water level and comparing the result with actual value from piezometer. The result shows that georadar can be used as a substitute for piezometers to measure porewater presure.

Keywords
georadar, porewater presure, dam, Sutami dam

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/HR4we8L9QFrm

Corresponding Author
Samsul Hidayat

Institutions
1) Jurusan Fisika FMIPA Universitas Negeri Malang
2) Jurusan Biologi FMIPA Universitas Negeri Malang
3) Jurusan Kimia FMIPA Universitas Negeri Malang
4) Jurusan Elektro FT Universitas Negeri Malang
5) Mahasiswa Jurusan Fisika FMIPA Universitas Negeri Malang

Abstract
The Unmanned Aerial Vehicles (UAV) technologies are growing rapidly. This is supported by sensor, control, and actuator technology. The development of UAV technology strongly supports for surveys, exploration, real-time monitoring territory, and so on. Multirotor UAVs is use brushless motors as a driver for moving. Brushless motor controlled by ESC. ESC receives DC power to be converted into commutative DC to drive brushless motors. ESC actually also senses the position of brushless motor rotors in determining their command. Battery energy efficiency, critical, the remaining flight time are important thing of UAVs. For this reason, the purpose of this research is to create a device that can be used for consumption monitoring of wireless brushless motor with Android smart phone devices. The steps taken are the design of android smart phone software / applications and design of current sensors with the hall effect phenomenon. The large magnetic field in the current of the wire is directly proportional to the large current through the conductor, and inversely proportional to the square of the distance. The magnetic field can cause concentrations of electrons to certain sides of each conductor plate. This phenomenon can cause a potential difference in the conductor plate and is often called the hall effect. Magnitic flux is continued by the permeability of the material exposed to magnetic flux. By providing iron core material, or ferrite ring, magnetic flux will accumulate on the ferrite ring. The hall sensor inserted at the space of the ferrite ring will be more rich in magnetic flux. This is used for measuring current without breaking the conductor. The hall of the voltage value are transmitted with the HC-05 bluetooth module to the Android smart phone for displaying..

Keywords
wireless, current sensor, bluetooth

Topic
Electromagnetic Methods

Link: https://ifory.id/abstract/HkgFyXeb2Mw6